Additional file 1 of A 30,000-km journey by Apus apus pekinensis tracks arid lands between northern China and south-western Africa

Additional file 1. Table S1. Distribution of data over years. Table S2. Key phenological parameters of migration of different sex individuals of A. a. pekinensis breeding in Beijing. Table S3. Results of comparative analysis of characteristic parameters between female and male pekinensis using t-test. Table S4. Results of comparative analysis of characteristic parameters between pekinensis from Beijing (N=25) and nominate apus from Sweden (N=25) using t-test. Table S5. Monthly and annual precipitation (mm) at several sites reported in the breeding areas of both subspecies.